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Amphiphilic block copolymers directed synthesis of mesoporous nickel-based oxides with bimodal mesopores and nanocrystal-assembled walls

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Chinese Chemical Letters 2019年第12期30卷 2003-2008页

作者： Yuan Ren Xuanyu Yang Xinran Zhou Wei Luo Yi Zhang Xiaowei Cheng Yonghui Deng Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan UniversityShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

mesoporous late-transition metal oxides have great potential in applications of energy,catalysis and chemical sensing due to their unique physical and chemical properties.However,their synthesis via the flexible and scalable soft-template method remain a great challenge,due to the weak organic-inorganic interaction between the frequently used surfactants(e.g.,Pluronic-type block copolymers) and metal oxide precursors,and the low crystallization temperature of metal oxides.In this study,ordered mesoporous NiO with dual mesopores,high surface area and well-interconnected crystalline porous frameworks have been successfully synthesized via the facile solvent evaporation-induced co-assembly(EICA) method,by using lab-made amphiphilic diblock copolymer polystyrene-b-poly(4-vinylpyridine)(PS-b-P4 VP) as both the structure-directing agent(the soft template) and macromolecular chelating agents for nickel species,THF as the solvent,and nickel acetylacetonate(Ni(acac)2) as inorganic precursor.Similarly,by using Ni(acac)2 and Fe(acac)3 as the binary precursors,ordered mesoporous Fedoped NiO materials can be obtained,which have bimodal mesopores of large mesopores(32.5 nm) and secondary mesopores(4.0-11.5 nm) in the nanocrystal-assembled walls,high specific surface areas(~74.8 m^2/g) and large pore value(~0.167 cm^3/g).The obtained mesoporous Fe-doped NiO based gas sensor showed superior ethanol sensing performances with good sensitivity,high selectivity and fast response-recovery dynamics.

关键词： Block copolymer Co-assembly Metal oxides mesoporous Gas sensing

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Synthesis of mesoporous nano-TiO_(2)doped with Sn by auto-assembly method and photo-catalytic property

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Science China Chemistry 2005年第5期48卷 436-441页

作者： ZHANG Meihong DING Shiwen WANG Zhenxing ZHANG Yuzhuo College of Chemistry and Environmental Science Hebei University Baoding 071002 China College of Chemistry and Environmental Science Hebei University Baoding 071002 China College of Chemistry and Environmental Science Hebei University Baoding 071002 China College of Chemistry and Environmental Science Hebei University Baoding 071002 China

A series of mesoporous nano-TiO2 material doped with Sn are synthesized by a homogenous precipitation method aided by microwave heating, using TiCl4 and SnCl4 as raw materials, urea as precipitator, active carbon as templet, and soluble starch as anti- agglomer-ating reagent. XRD results show that the precursor exists in the amorphous phase, and trans-forms to anatase structure above 400℃. TEM results show that the particle is in spherical shape and the average diameter is 20 nm. EDS results show that the measuring value of compound is in accord with the actual value of the raw materials, and the doping uniformity is good. The photo-catalytic experimental results show that the highest photo-catalytic efficiency can be ob-tained when the content of Sn is 10% (mol pecent), and the decolorization rate of navy blue dye can be as high as 100% after being illuminated by sunlight for 70 min. The photo-catalytic reac-tion is a first-order kinetic reaction.

关键词： nano-TiO2 doped with Sn, microwave synthesis, template control, homogenous precipitation, mesoporous material, photo-catalysis.

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Spherical hollow mesoporous silica supported phosphotungstic acid as a promising catalyst for α-arylstyrenes synthesis via Friedel-Crafts alkenylation

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Chinese Chemical Letters 2019年第3期30卷 729-734页

作者： Xianhui Wang Zhongkui Zhao State Key Laboratory of Fine Chemicals Department of Catalysis Chemistry and Engineering School of Chemical Engineering Dalian University of Technology

In this work, a spherical hollow mesoporous silica(SHMS) with high surface area(902 m^2/g) and large mesopore volume(1.31 cm^3/g) was prepared via a facile and scalable two-step soft-hard dual templateassisted sol-gel approach(OSDSG) by using glucose-derived carbon nano/micro particles(NMCP) as a hard template and cetyltrimethylammonium bromide(CTAB) as a soft template,respectively,in which the size-preselected carbon submicro-particle was used to replace ploymer sphere, and no extra precious additives like n-octadecyltrimethoxysilane(C18TMS). Supported phosphotungstic acid(PTA) catalysts on SHMS(PTA/SHMS) and on previously reported spherical mesoporous silica(PTA/SMS) with 25 wt% of PTA loading were prepared and employed as solid acid catalysts for diverse reactions. Transmission electron microscopy(TEM),N_2 adsorption-desorption, X-ray diffraction(XRD), and NH_3 temperatureprogrammed desorption(NH_3-TPD) techniques were employed to characterize the nature of carriers and supported PTA catalysts for revealing the structure-performance relationship. The developed PTA/SHMS catalyst demonstrates much higher catalytic activity than PTA/SMS for diverse reactions including alkenylation, esterification, alkylation, and benzylation, ascribed to the strengthened mass transfer and enlarged exposure degree of acidic sites to reactants those resulting from unique hollow and mesoporous morphology. Moreover, PTA/SHMS catalyst also exhibits outstanding catalytic performance for the diverse a-arylstyrenes via solid acid-mediated alkenylation. PTA/SHMS could be considered as a practical solid acid catalyst for diverse transformations.

关键词： Spherical hollow mesoporous silica Solid acid Mass transfer Alkenylation Heterogeneous catalysis

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Adsorptive desulfurization of diesel with mesoporous aluminosilicates

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Science China Chemistry 2009年第3期52卷 276-281页

作者： TANG Huang LI WangLiang LIU QingFen GUAN LiLi SONG JiaQing XING JianMin LIU HuiZhou National Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China SINOPEC Research Institute of Petroleum Processing Beijing 100083China

mesoporous aluminosilicates (MAS) bearing microporous zeolite units and mesoporous structures were synthesized by the hydrothermal method. Adsorptive desulfurization ability of model oil and hy-drotreated diesel was studied. The effects of template concentration, crystalization time and calcination time were investigated. The desulfurization ability of adsorbents was improved by transitional metal ion-exchanging. The adsorptive desulfurization of diesel was carried out on a fixed-bed system. The results show that the adsorptive capacity is MAS>MCM-41>NaY. The improvement of desulfurization ability of MAS by Cu+ is more significant than that of Ag+.

关键词： diesel adsorptive desulfurization mesoporous aluminosilicates acidity pore texture

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Synthesis of silver/silica mesoporous composite

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Chinese Science Bulletin 1996年第22期41卷 1868-1872页

作者：蔡伟平谭铭汪国忠张立德 Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

The porous solids 2—50 nm in pore diameter and larger than 40% of porosity are de-fined as the mesoporous solid.Their pore number is up to 1019/g and the specific surfacearea up to 900m2/g.Therefore,the mesoporous solids have important application in thecatalysis,sorption and separation,etc.According to the arrangement of the pores。

关键词： nano-scaled particle mesoporous solid mesoporous composite sol-gel XRD TEM.

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Preparation and Characterization of Hybrid Luminescence mesoporous MCM-48 Doped with Eu( Ⅲ ) Complex

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Journal of Rare Earths 2004年第Z1期22卷 144-146页

作者： Meng Qingguo Li Huanrong Peng Chunyun Zhang Hongjie Boutinaud P Franville A C Mahiou R Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Laboratoire des Materiaux Inorganiques UMR CNRS 6002 Universite Blaise-Pascal et ENSCCF 24 Avenue des LandaisF-63177 Aubiere CedexFrance Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Laboratoire des Materiaux Inorganiques UMR CNRS 6002 Universite Blaise-Pascal et ENSCCF 24 Avenue des Landais F-63177 Aubiere Cedex France Laboratoire des Materiaux Inorganiques UMR CNRS 6002 Universite Blaise-Pascal et ENSCCF 24 Avenue des Landais F-63177 Aubiere Cedex France Laboratoire des Materiaux Inorganiques UMR CNRS 6002 Universite Blaise-Pascal et ENSCCF 24 Avenue des Landais F-63177 Aubiere Cedex France

The preparation of hybrid mesoporous MCM-48 grafted by vinyl group via post-grafting process was reported and studied by X-ray diffraction, BET and 29Si solid MAS NMR.An organic β-diketonate Europium complex the corr... 详细信息

关键词： mesoporous hybrid materials rare earths

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Promoted conversion of polysulfides by MoO_2 inlaid ordered mesoporous carbons towards high performance lithium-sulfur batteries

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Chinese Chemical Letters 2019年第2期30卷 521-524页

作者： Yawei Chen Shuzhang Niu Wei Lv Chen Zhang Quanhong Yang Engineering Laboratory for Functionalized Carbon Materials Shenzhen Key Laboratory for Graphene-based MaterialsGraduate School at ShenzhenTsinghua University Tsinghua-Berkeley Shenzhen Institute Tsinghua University School of Marine Science and Technology Tianjin University School of Chemical Engineering and Technology Tianjin University

As polar materials, transition-metal oxides have shown great potentials to improve the adsorption of lithium polysulfides in lithium-sulfur batteries. Herein, a MoO_2-ordered mesoporous carbon (M-OMC)hybrid was designed as the sulfur host, in which MoO_2 is inlaid on the surface of ordered mesoporous carbons that can store active materials and provide fast electron transfer channel due to its ordered pore structure. The MoO_2 can effectively prevent the migration of polysulfides through the chemical adsorption and promote the conversion of polysulfides towards Li-sulfur battery.

关键词： Lithium-sulfur batteries Ordered mesoporous carbon Electron transportation Chemical adsorption Catalytic effect Polysulfides shuttling

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Morphology-controlled synthesis of mesoporous silica with co-template of surfactant P123 and ionic liquid [Dmim]Cl

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Chinese Chemical Letters 2018年第8期29卷 1305-1309页

作者： Pei Han Tuanchun Liu Xiaowei Ji Shaokun Tang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering & Technology Tianjin UniversityTianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Tianjin 300072 China

mesoporous silicas with different morphologies have attracted great interest in the fields of catalysis,separation and so on. In this study, silica hollow tubes with ordered mesopores were synthesized via a novel sol-gel method with an ionic liquid 1-decyl-3-methylimidazolium chloride（[Dmim]Cl） and a nonionic surfactant P123（PEO_（20）PPO_（70）PEO_（20）） as the co-template. Comparatively, silica hollow spheres with disordered mesopores were synthesized with only [Dmim]Cl as the template. The template dosage is the key factor in controlling the morphology. The micelles assembly mechanism based on hydrogen bonding interactions is proposed to be responsible for the formation of the final silica morphology and mesostructure.

关键词： Silica hollow spheres Silica tubes mesoporous Co-template Ionic liquids P123

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Thin Film of mesoporous MCM-41 Grown on Indium-Tin-Oxide Glass Substrate

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Chinese Chemical Letters 1999年第4期10卷 335-338页

作者： Zhang, J Xiong, HM Ding, H Cai, Q Chen, JS Pang, WQ Jilin Univ Key Lab Inorgan Synthesis & Preparat Chem Changchun 130023 Peoples R China Jilin Univ Dept Chem Changchun 130023 Peoples R China Chongqing Teachers Coll Dept Chem Yongchuan 402168 Peoples R China

From a basic solution containing celyltrimethylammonium cations as the template, thin film of mesoporous MCM-41 has been grown on the surface of a pre-treated indium-tin-oxide conducting glass substrate. The channel axis of the film is oriented parallel with the surface plane of the substrate, and the film is stable after careful removal of template in vacuum.

关键词： mesoporous MCM-41 film ITO glass substrate basic medium synthesis

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Synthesis and Characterization of mesoporous Titanium Dioxide Spheres

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Chemical Research in Chinese Universities 2011年第3期27卷 350-353页

作者： GULI Mi-na CHEN Yu-ning LI Xiao-tiao Solar Energy Center Renewable Energy School North China Electric Power University Beijing 102206 P. R. China Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China

mesoporous titanium dioxide spheres were synthesized by a convenient solvothermal method at room temperature with tetraethyl titanate as a precursor. Investigation by means of X-ray diffraction（XRD）, transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, and N2 adsorption-desorption isotherms confirms that the sample has a mesostructure with a higher specific surface area and shows that the mesoporous TiO2 spheres have a diameter of 2 μm, the average pore size is about 5.9 nm, and the BET surface area and specific pore volume are about 236 m2/g and 2.116 cm3/g, respectively. The anatase and rutile mesoporous TiO2 spheres calcined at 700 °C show much better photocatalytic activity than the samples calcined at other temperatures and is comparable to an uncalcined sample in the photodegradation of Methyl Blue（MB） under the UV irradiation.

关键词： mesoporous Sphere Titanium dioxide

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